Abstract:Ukuze kushintshwe i-polyvinyl alcohol engaboli (PVA) slurry, i-hemp stalk cellulose ether-hydroxypropyl methylcellulose yalungiswa ngezinhlanga ze-hemp yezolimo, futhi yaxutshwa nesitashi esithile ukulungisa udaka. Intambo ehlanganisiwe ye-polyester-cotton T/C65/35 14.7 tex yayinosayizi futhi nokusebenza kwayo kosayizi kwahlolwa. Inqubo yokukhiqiza efanelekile ye-hydroxypropyl methylcellulose yaba kanje: ingxenye enkulu ye-lye yayingu-35%; isilinganiso sokucindezelwa kwe-alkali cellulose sasingu-2.4; Isilinganiso sevolumu ye-liquid ye-methane ne-propylene oxide yi-7: 3; hlambulula nge-isopropanol; ingcindezi yokusabela yi-2. 0MPa. Usayizi olungiswe ngokuxuba i-hydroxypropyl methylcellulose kanye nesitashi esithile une-COD ephansi futhi unobungani bemvelo, futhi zonke izinkomba zokulinganisa zingangena esikhundleni sikasayizi we-PVA.
Amagama angukhiye:i-hemp stalk; i-hemp stalk cellulose ether; polyvinyl utshwala; ukulinganisa kwe-cellulose ether
0.Isandulelo
I-China ingelinye lamazwe anemithombo yotshani enothile uma kuqhathaniswa. Umkhiqizo wesivuno ungaphezu kwamathani ayizigidi ezingama-700, kanti izinga lokusebenzisa utshani lingama-3% kuphela ngonyaka. Inani elikhulu lezinsiza zotshani alizange lisetshenziswe. Utshani buyinto ecebile yemvelo ye-lignocellulosic eluhlaza, engasetshenziswa ekuphakeleni, umanyolo, okuphuma ku-cellulose neminye imikhiqizo.
Njengamanje, ukukhipha ukungcola kwamanzi angcolile ohlelweni lokukhiqiza izindwangu sekungomunye wemithombo emikhulu yokungcola. Isidingo se-oksijini samakhemikhali se-PVA siphezulu kakhulu. Ngemva kokuba amanzi angcolile ezimbonini akhiqizwa yi-PVA ekunyatheliseni nasekudayeni ekhishelwa emfuleni, azovimbela noma abhubhise ukuphefumula kwezinto eziphilayo zasemanzini. Ngaphezu kwalokho, i-PVA ibhebhethekisa ukukhululwa nokufuduka kwezinsimbi ezisindayo ezindaweni ezihlala emanzini, okubangela izinkinga ezinkulu zemvelo. Ukwenza ucwaningo lokushintsha i-PVA nge-slurry eluhlaza, akudingekile ukuthi uhlangabezane nezidingo zenqubo yokulinganisa, kodwa futhi nokunciphisa ukungcoliswa kwamanzi nomoya ngesikhathi senqubo yokulinganisa.
Kulolu cwaningo, i-hemp stalk cellulose ether-hydroxypropyl methylcellulose (HPMC) yalungiswa ngeziqu ze-hemp ye-hemp yezolimo, futhi inqubo yayo yokukhiqiza kwaxoxwa ngayo. Futhi hlanganisa i-hydroxypropyl methylcellulose kanye nosayizi othile wesitashi njengosayizi wokulinganisa, uqhathanise nosayizi we-PVA, bese uxoxa ngokusebenza kwawo kosayizi.
1. Isivivinyo
1 . 1 Izinto kanye nezinsimbi
Isiqu se-Hemp, i-Heilongjiang; i-polyester-cotton blended ntambo T/C65/3514.7 tex; i-hemp stalk cellulose eyenziwe ngokwayo i-ether-hydroxypropyl methylcellulose; I-FS-101, isitashi esilungisiwe, i-PVA-1799, i-PVA-0588, i-Liaoning Zhongze Group Chaoyang Textile Co., Ltd.; propanol, premium grade; i-propylene oxide, i-glacial acetic acid, i-sodium hydroxide, i-isopropanol, ihlanzekile ngokuhlaziya; i-methyl chloride, i-nitrogen ephezulu.
Igedlela lokusabela le-GSH-3L, igedlela lokusabela le-GSH-3L, i-JRA-6 yesibonisi sedijithali sokugezela samagnetic esinyakazayo, i-DHG-9079A kagesi eshisisa izinga lokushisa eliqhubekayo ihhavini yokomisa, i-IKARW-20 i-agitator engumshini ongaphezulu, i-ESS-1000 umshini wokulinganisa isampula, YG 061/PC imitha yamandla yentambo eyodwa kagesi , I-LFY-109B isihloli sokuhuzuka kwentambo yekhompyutha.
1.2 Ukulungiswa kwe-hydroxypropyl methylcellulose
1. 2. 1 Ukulungiswa kwe-alkali fiber
Hlukanisa isiqu se-hemp, usihlikihle sibe ngamameshi angama-20 ngesipopofifi, engeza impushana ye-hemp stalk ku-35% we-NaOH aqueous solution, bese uyicwilisa ekamelweni lokushisa isikhathi esingu-1. 5 ~ 2. 0 h. Khama i-alkali fibre egxilile ukuze isilinganiso sesisindo se-alkali, i-cellulose, namanzi sibe ngu-1. 2:1. 2:1.
1. 2. 2 Ukusabela kwe-Etherification
Phonsa i-alkali cellulose elungisiwe eketelani lokusabela, engeza u-100 mL we-isopropanol njenge-diluent, engeza uketshezi u-140 mL we-methyl chloride kanye no-60 mL we-propylene oxide, vacuumze, futhi ucindezele ku-2. 0 MPa, phakamisa kancane izinga lokushisa libe ngu-45°C amahora angu-1-2, bese usabela ku-75°C amahora angu-1-2 ukuze ulungise i-hydroxypropyl methylcellulose.
1. 2. 3 Ngemuva kokucubungula
Lungisa i-pH ye-etherified cellulose ether nge-glacial acetic acid ibe ngu-6. 5 ~ 7. 5, igezwe nge-propanol izikhathi ezintathu, futhi yomiswa kuhhavini ongu-85°C.
1.3 Inqubo yokukhiqiza i-hydroxypropyl methylcellulose
1. 3. 1 Umthelela wesivinini sokujikeleza ekulungiseleleni i-cellulose ether
Imvamisa ukusabela kwe-etherification kuwukusabela okuhlukahlukene kusuka ngaphakathi kuya ngaphakathi. Uma kungekho amandla angaphandle, kunzima ku-etherification agent ukufaka i-crystallization ye-cellulose, ngakho-ke kuyadingeka ukuhlanganisa ngokugcwele i-etherification agent ne-cellulose ngendlela yokugqugquzela. Kulolu cwaningo, kusetshenziswe i-reactor ephezulu yokucindezela. Ngemva kokuhlolwa okuphindaphindiwe nemibukiso, isivinini esikhethiwe sokuzungezisa sasingu-240-350 r/min.
1. 3. 2 Umphumela wokugxila kwe-alkali ekulungiseleleni i-cellulose ether
I-alkali ingacekela phansi ukwakheka okuhlangene kwe-cellulose ukuze ikhukhumale, futhi lapho ukuvuvukala kwesifunda se-amorphous kanye nesifunda se-crystalline kuvame ukuhambisana, i-etherification iqhubeka kahle. Enqubweni yokukhiqiza ye-cellulose ether, inani le-alkali elisetshenziswa kunqubo ye-cellulose alkalization linethonya elikhulu ekusebenzeni kahle kwe-etherification kwemikhiqizo ye-etherification kanye nezinga lokushintshanisa amaqembu. Enqubweni yokulungiselela i-hydroxypropyl methylcellulose, njengoba ukugxila kwe-lye kukhula, okuqukethwe kwamaqembu e-methoxyl nakho kuyanda; ngokuphambene, lapho ukugxila kwe-lye kuncipha, i-hydroxypropyl methylcellulose Okuqukethwe okuyisisekelo kukhulu. Okuqukethwe kweqembu le-methoxy kuhambisana ngokuqondile nokuhlushwa kwe-lye; okuqukethwe kwe-hydroxypropyl kuqhathaniswa ngokuphambene nokuhlangana kwe-lye. Ingxenye enkulu ye-NaOH ikhethwe njengama-35% ngemva kokuhlolwa okuphindaphindiwe.
1. 3. 3 Umphumela wesilinganiso sokucindezela se-alkali cellulose ekulungiseleleni i-cellulose ether
Inhloso yokucindezela i-alkali fiber ukulawula okuqukethwe kwamanzi ku-alkali cellulose. Uma isilinganiso sokucindezela sisincane kakhulu, okuqukethwe kwamanzi kuyanda, ukuhlangana kwe-lye kuncipha, izinga le-etherification liyehla, futhi i-etherification agent i-hydrolyzed futhi ukusabela okusemaceleni kuyanda. , ukusebenza kahle kwe-etherification kuyancipha kakhulu. Uma isilinganiso sokucindezela sikhulu kakhulu, okuqukethwe kwamanzi kuncipha, i-cellulose ayikwazi ukuvuvuka, futhi ingakwazi ukuphinda isebenze, futhi i-etherification agent ayikwazi ukuxhumana ngokugcwele ne-alkali cellulose, futhi ukusabela akulingani. Ngemva kokuhlolwa okuningi nokuqhathanisa ngokucindezelayo, kwanqunywa ukuthi isilinganiso sobuningi be-alkali, amanzi ne-cellulose sasingu-1. 2:1. 2:1.
1. 3. 4 Umthelela wezinga lokushisa ekulungiseni i-cellulose ether
Enqubweni yokulungiselela i-hydroxypropyl methylcellulose, qala ulawule izinga lokushisa ku-50-60 °C futhi uligcine endaweni yokushisa engashintshi amahora amabili. Ukusabela kwe-hydroxypropylation kungenziwa cishe ku-30 ℃, futhi izinga lokusabela kwe-hydroxypropylation likhuphuka kakhulu ku-50 ℃; nyusa kancane izinga lokushisa libe ngu-75 ℃, bese ulawula izinga lokushisa amahora ama-2. Ku-50 ° C, ukusabela kwe-methylation akusabeli neze, ku-60 ° C, izinga lokuphendula lihamba kancane, futhi ku-75 ° C, izinga lokusabela kwe-methylation liyasheshisa kakhulu.
Ukulungiswa kwe-hydroxypropyl methylcellulose ngokulawulwa kokushisa okunezigaba eziningi akukwazi nje ukulawula ibhalansi yamaqembu e-methoxyl ne-hydroxypropyl, kodwa futhi kusize ekunciphiseni ukusabela okusemaceleni kanye nokwelashwa ngemva kokwelashwa, nokuthola imikhiqizo enesakhiwo esinengqondo.
1. 3. 5 Umthelela wesilinganiso somthamo we-etherification agent ekulungisweni kwe-cellulose ether
Njengoba i-hydroxypropyl methylcellulose iyi-ether ejwayelekile engeyona i-ionic exubile, amaqembu e-methyl ne-hydroxypropyl athathelwa indawo ngamaketango ahlukene e-hydroxypropyl methylcellulose macromolecular, okungukuthi, u-C ohlukile endaweni ngayinye yendandatho kashukela. Ngakolunye uhlangothi, isilinganiso sokusabalalisa se-methyl ne-hydroxypropyl sinokuhlakazeka okukhulu nokungahleliwe. Ukuncibilika kwamanzi kwe-HPMC kuhlobene nokuqukethwe kweqembu le-methoxy. Uma okuqukethwe kweqembu le-methoxy kuphansi, kungancibilika ku-alkali eqinile. Njengoba okuqukethwe kwe-methoxyl kwanda, kuba bucayi kakhulu ekuvuvukeni kwamanzi. Ukuphakama kokuqukethwe kwe-methoxy, kungcono ukuncibilika kwamanzi, futhi kungakhiwa kube udaka.
Inani le-etherifying agent i-methyl chloride ne-propylene oxide inomthelela oqondile kokuqukethwe kwe-methoxyl ne-hydroxypropyl. Ukuze kulungiswe i-hydroxypropyl methylcellulose enokuncibilika okuhle kwamanzi, isilinganiso sevolumu ye-liquid ye-methyl chloride ne-propylene oxide sikhethwe njengo-7:3.
1.3.6 Inqubo yokukhiqiza efanele ye-hydroxypropyl methylcellulose
Imishini yokusabela iyi-reactor eshukunyiswa yingcindezi ephezulu; isivinini sokujikeleza singama-240-350 r/min; ingxenye enkulu ye-lye ingu-35%; isilinganiso sokucindezela se-alkali cellulose singu-2. 4; I-Hydroxypropoxylation ku-50 ° C amahora angu-2, i-methoxylation ku-75 ° C amahora angu-2; i-etherification agent methyl chloride kanye nepropylene oxide liquid volume ratio 7:3; i-vacuum; ingcindezi 2. 0 MPa; I-diluent yi-isopropanol.
2. Ukutholwa nokusebenzisa
2.1 I-SEM ye-hemp cellulose ne-alkali cellulose
Uma kuqhathaniswa i-cellulose ye-hemp engalashwanga kanye ne-hemp cellulose ephathwa ngo-35% we-NaOH, kungatholakala ngokucacile ukuthi i-alkalized cellulose inokuqhekeka okungaphezulu, indawo engaphezulu, umsebenzi ophezulu kanye nokusabela okulula kwe-etherification.
2.2 Ukunqunywa kwe-Infrared Spectroscopy
I-cellulose ekhishwe kuzinhlanga ze-hemp ngemva kokwelashwa kanye ne-infrared spectrum ye-HPMC elungiswe ku-hemp stalk cellulose. Phakathi kwazo, ibhande lokumunca eliqinile nelibanzi ku-3295 cm -1 ibhande lokumunca lokudlidliza elinwebekayo leqembu le-HPMC lenhlangano ye-hydroxyl, ibhande lokumunca ku-1250 ~ 1460 cm -1 ibhendi yokumuncwa ye-CH, CH2 kanye ne-CH3, kanye nokumuncwa. ibhande eku-1600 cm -1 yibhande lokumunca lamanzi ebhendi yokumuncwa kwe-polymer. Ibhendi yokumunca engu-1025cm -1 iyibhande lokumunca lika-C—O—C ku-polymer.
2.3 Ukuzimisela kwe-Viscosity
Thatha isampula ye-cannabis stalk cellulose ether elungisiwe bese uyifaka ebhekhani ukuze ulungise isisombululo samanzi esingu-2%, usishukumise kahle, ulinganise ukubukeka kwayo nokusimama kwe-viscosity nge-viscometer, futhi ulinganise i-viscosity evamile izikhathi ezi-3. I-viscosity yesampula ye-cannabis stalk cellulose ether elungisiwe yayiyi-11. 8 mPa·s.
2.4 Uhlelo lokusebenza lokulinganisa
2.4.1 Ukucushwa kwe-slurry
I-slurry yalungiswa ibe yi-1000mL ye-slurry enengxenye enkulu ye-3.5%, igoqwe ngokulinganayo nge-mixer, bese ifakwa emanzini okugeza futhi ishise ku-95 ° C ihora elingu-1. Ngesikhathi esifanayo, phawula ukuthi isitsha sokupheka se-pulp kufanele sivalwe kahle ukuvimbela ukugxila kwe-slurry ekukhuleni ngenxa yokuhwamuka kwamanzi.
2.4.2 Ukwakheka kwe-slurry pH, ukuxubeka ne-COD
Xuba i-hydroxypropyl methyl cellulose nosayizi othize wesitashi ukuze ulungise udaka (1#~4#), bese uqhathanisa ne-PVA formula slurry (0#) ukuze uhlaziye i-pH, ukuxubeka ne-COD. Intambo ehlanganisiwe ye-polyester-cotton T/C65/3514.7 tex yalinganiswa emshinini wokulinganisa wesampula we-ESS1000, futhi ukusebenza kwawo kosayizi kwahlaziywa.
Kuyabonakala ukuthi i-hemp stalk cellulose ether eyenziwe ekhaya kanye nosayizi othize wesitashi 3 # kuwukwakheka kosayizi ofanele: 25% i-hemp stalk cellulose ether, 65% isitashi esilungisiwe kanye no-10% FS-101.
Yonke idatha yokulinganisa iqhathaniswa nedatha yokulinganisa kasayizi we-PVA, okubonisa ukuthi usayizi oxubile we-hydroxypropyl methylcellulose kanye nesitashi esithile sinokusebenza okuhle kokulinganisa; i-pH yayo iseduze nokungathathi hlangothi; i-hydroxypropyl methylcellulose kanye nesitashi esithile I-COD (17459.2 mg/L) yosayizi othize oxubile wesitashi yayingaphansi kakhulu kunosayizi we-PVA (26448.0 mg/L), futhi ukusebenza kokuvikelwa kwemvelo kwakukuhle.
3. Isiphetho
Inqubo yokukhiqiza efanelekile yokulungiselela i-hemp stalk cellulose ether-hydroxypropyl methylcellulose ukuze silinganiswe imi kanje: ireactor eshukunyiswa umfutho ophezulu enesivinini sokuzungezisa esingu-240-350 r/min, ingxenye enkulu ye-lye engu-35%, kanye nesilinganiso sokucindezela. ye-alkali cellulose 2.4, izinga lokushisa le-methylation lingu-75 ℃, futhi izinga lokushisa le-hydroxypropylation lingu-50 ℃, ngalinye ligcinwa amahora angu-2, isilinganiso sevolumu ye-methyl chloride ne-propylene oxide ngu-7: 3, i-vacuum, ingcindezi yokusabela yi-2.0 MPa, I-isopropanol iyi-diluent.
I-Hemp stalk cellulose ether yasetshenziswa esikhundleni sikasayizi we-PVA wokulinganisa, futhi isilinganiso sosayizi esifanele sasiyi: 25% i-hemp stalk cellulose ether, 65% isitashi esilungisiwe kanye no-10% FS‐101. I-pH ye-slurry ingu-6.5 kanti i-COD (17459.2 mg/L) iphansi kakhulu kunaleyo ye-PVA slurry (26448.0 mg/L), ebonisa ukusebenza kahle kwemvelo.
I-Hemp stalk cellulose ether yasetshenziselwa ukulinganisa esikhundleni sikasayizi we-PVA ukuze kukalwe intambo ehlanganisiwe ye-polyester-ukotini T/C 65/3514.7tex. Inkomba yokulinganisa iyalingana. I-hemp stalk cellulose ether entsha kanye nosayizi oxubile wesitashi ungangena esikhundleni sikasayizi we-PVA.
Isikhathi sokuthumela: Feb-20-2023